Process of manufacturing dyed artificial silk



Patented Dec. 10, 1929 UNITED STATES PATENT OFFICE f Emmi: IAN .ux'on iranssnn, or ARNHEH, nn'rnnnnmns, assrenon rerun!- LOOZE vmmoorscmr nnnnnnannscnn xuns'rznnnranmnx, or -mnmr,

manna-Anna PROCESS O1 IANUIAGTUBI'NG DYED ARTIFICIAL SILK Narrowing. Application med December 15, 1925, Serial No. 75,620, and in Germany December 15, me.

My invention relates to a process for al tering artificial silk and the like with respect to its absorptive power for dyes. It is known, in weaving artificial silk on looms of the 5 Jaufiuard ty e, to dye the silk with different yes an -to weave this silk on the looms. in atterns.

have found, however, that it is possible to work the artificial silk on looms of the J acquard type in an undyed condition and to obtain co or effects in dyein the piece goods. This I attain by using arti cial sllkwith different'absorptive power for dyes and in such 4 a way that I treat an amount of material 1| with a'certain absorptive power so that part of it obtains a larger or smaller absorptive power than the other part of the batch. It is a known art to prepare artificial silk with a larger or smaller absorptive power for go dyes by ripening the viscose longer or shorter.

.My invention aims, however, at aifecting the absorptive power for dyes of prepared artificial silk in quite another way, namely by altering the contents of non-cellulosic substances, such ,as oxycellulose; hemicellulose, hydrocellulose, by means of suitable measures.

For'instance, my process may be carried out in such a way that the contents of oxycellulose of the fibres and. in consequence thereof the absorptive power for dyes is increased by heating the fibres or threads in airor in oxidizing means. y Ifthe absorptive power for dyes is required to be decreased I may treat the prepared threads with substances which remove the oxycellulose, hemicellulose or hydrocellulose wholly or partially. I have obtained favorable results inheating the prepared threads in glycerine and subse iuently washing the thus treated material. Iowever, I may also ,use other materials than glycerine, provided that the. do not unfavorab y affect the artificial si' The following examples are merely illustrative 'andin no way, are to be understood as limiting the scope of my patent.

Ordinary'viscose silk repared in any of .7 to the known ways is heate in glycerine at ap'-\;

proximately 150 G. Then the artificial silk is washed and dried in the usual way. Thereupon the silk is dyed in a watery solution of methylene blue containing about half a ram of d e per liter, at a temperature of a out It .will appear that the silk is colored alight blue and that the same viscosesilk not treated with heated glycerine will have after being treated in the same dye of thersame concentration and temperature a dark blue color.

If the silk is treated at room temperature with a diluted solution of sodium hy ochlorite during two hours the same wil after washing and dryin obtain a darker color than non-treated silk.

Ewample? Ordinar viscose silk is heated with lycerine in t e way as speci ed in Examp e 1. After washing and drying. the same is dyedin a bath containing about 1 grain of diamondfuchsine per liter. It appears that the threads obtain a bright red color, which is much li hter than that obtained by untreated artificia silk.

Having thus described my invention, what I claim as newand desire to secure by Letters Patent is 1. The process of modif in the dye absorptive properties of arti cia silk containing 0 cellulose, hemicellulose or hydrocellulose w ich comprises treating said silkwith glycerine in a heated state.

2. The process of modifying the dye absorpt-ion properties of artificial silk made from viscose containing on cellulose, hemicellulose or hydrocellulo'se, w ich comprises treating it with heated glycerine. v

In testimony whereof Iaifix my. signature.

'. HERD!!! .IAI JAIQI JAM 

